package JqueryStudentUtils;

import java.sql.*;

public class DbConnection {
    private static final String DRIVER;
    private static final String URL;
    private static final String USERNAME;
    private static final String PASSWORD;

    /*静态代码块*/
    static {
        DbConfigReader dbConfigReader = new DbConfigReader();
        DRIVER = dbConfigReader.getValue("driver");
        URL = dbConfigReader.getValue("url");
        USERNAME = dbConfigReader.getValue("username");
        PASSWORD= dbConfigReader.getValue("password");
    }
    /*建立数据库连接*/
    public static Connection getConnection(){
        Connection con = null;
        PreparedStatement pre = null;
        ResultSet res = null;
        try {
            Class.forName(DRIVER);
            con = DriverManager.getConnection(URL,USERNAME,PASSWORD);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
         return con;
    }
    public static void close(ResultSet res, PreparedStatement sta, Connection con){

            try {
                if(res != null) {

                    res.close();
                }
                if(sta != null){
                    sta.close();
                }
                if(con != null){
                    con.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
        }
    }
}
